composio-google

Adapts Composio tools to the Vertex AI SDK (vertexai.generative_models) as FunctionDeclaration objects for Gemini function calling.

Installation

pip install composio composio-google google-cloud-aiplatform

Set COMPOSIO_API_KEY (create one at https://dashboard.composio.dev/settings) in your environment. Vertex AI authenticates with Google Cloud credentials; run gcloud auth application-default login or set GOOGLE_APPLICATION_CREDENTIALS.

Quickstart

GoogleProvider is non-agentic: the model returns function calls, and composio.provider.handle_response executes every function call in the response through the session and returns the results.

import vertexai
from vertexai.generative_models import GenerativeModel, Tool

from composio import Composio
from composio_google import GoogleProvider

vertexai.init(project="your-gcp-project", location="us-central1")

composio = Composio(provider=GoogleProvider())

# Create a session for your user
session = composio.create(user_id="user_123")
tools = session.tools()

model = GenerativeModel(
    "gemini-3.7-flash",
    tools=[Tool(function_declarations=tools)],
)
chat = model.start_chat()

response = chat.send_message(
    "Send an email to john@example.com with the subject 'Hello' and body 'Hello from Composio!'"
)

# Execute the function calls the model requested
results = composio.provider.handle_response(session=session, response=response)
print(results)

To execute a single call instead of the whole response, use composio.provider.execute_tool_call(session=session, function_call=part.function_call). For tools fetched with composio.tools.get(), pass user_id= instead of session=.

composio-google vs composio-gemini

This package targets the Vertex AI SDK (vertexai.generative_models, installed via google-cloud-aiplatform). composio-gemini targets the newer google-genai SDK with Automatic Function Calling. For new projects, use composio-gemini.

Links

• Google provider docs: https://docs.composio.dev/docs/providers/google
• Composio docs: https://docs.composio.dev